Self-weighing scale.



No. 634,756. Patented 061. I0, I899. A. W. B. JOHNSON.

SELF WEIGHING SCALE.

(Application filed Dec. 21, 189B.)

3 Sheets-Sheet I,

(No Model.)

/N VENTOH A TTOHNE Y8.

WITNESSES Tn: NORWS PEYniS C0v 'PHOYLMJTNQ, WASNVNFITON. D. c

No. 634,756. Patented Oct. 10, I899.

' A. W. B. JOHNSON.

SELF WEIGHING SCALE.

(Applicntion filed Dec. 21, 1898.) (No Model.) 3 SheetsSheet 2,

WITNESSES /N VEN 70/? W w: NORRIS PETERS co. mow-Una \vAwmr-mm u. c

No. 634,756. Patented Oct. l0, I899. A. w. a. JOHNSON.

SELF WEIGHING SCALE.

(Applicltion flied Dec. 21, 1898.) (No Model.) 3 Shoots-Sheet 3.

WITNESSES 71g 5. IN vavron A TTOHNEYS.

UNITED STATES PATENT ()FFICE.

ALVA \V. B. JOHNSON, OF MOUNT VERNON, ILLINOIS.

SELF-WEIGHING SCALE.

SPECIFICATION forming part of Letters Patent No. 634,756, dated October 10, 1899.

Application filed December 21, 1898. Serial No. 699,934. No model.)

To (all who/1t ('15 may cancer/1.:

Beit known that I, ALVA IV. B. JOHNSON, of Mount Vernon, in the county of Jefferson and State of Illinois, have in vented a new and Im proved Self-Veighing Scale, of which the following is a full, clear, and exact description.

The invention relates to weighing-scales such as shown and described in the application for Letters Patent of the United States, Serial No. 066,127, filed by me on January 10, 1898, and allowed on October 25, 1898.

The objectof the present invention is to provide certain new and useful improvements in self-weighing scales for overcoming the momentum of the electric motor after the current is shut off, so as to insure an accurate weighing of the material.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of my invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a sectional side elevation of the improvement on the line 1 1 in Fig. 2. Fig. 2 is a transverse section of the same on the line 2 2 in Fig. 1. Fig. 3 is a similar view of part of the same with parts in adifferent position. Fig.4 is an enlarged transverse section of the motor and adjacent parts, and Fig. 5 is a transverse section of the motor-shaft.

In the weighing-scale presently to be de scribed in detail the load-receiver is first overloaded and then the surplus material is automatically removed from the receiver to obtain a true load in the manner more fully described in the application above referred to, so that it is deemed unnecessary to describe in detail the operation of the machine.

The weighing-scale is provided with a suitably-constructed frame A and a platform 13, mounted in the usual manner on sets of levers C C, of which the levers O are connected with the levers O, as indicated at O in Fig. 3, and the levers C are connected by verticallydisposed links D with a central beam E of any approved construction. The load-receiver is in the form of a scoop F and contains an elevator G for removing the surplus material of the overload and discharging this surplus material into a vessel H, while the load of the scoop is discharged into a bag H or other receptacle, both the bag H and scoop F being set on a table A, forming part of the frame A.

The driving-shaft G for the elevator G is provided on one outer end with a gear-wheel G: in mesh with a gear-wheel I, mounted to rotate loosely on the shaft J of an electric motor J, of any approved construction, and set on the platform 13. A solenoid K, of any approved construction, is provided 'with a soft-metal core K in the form of a shaft, mounted to slide in and to turn with the shaft J, as is plainly indicated in Figs. a and 5, the core K opposite the solenoid K being provided with a disk L, having teeth L, adapted to engage similar teeth I on the gear-wheel I, so that when the said teeth are in engagement with each other and the motor J is in action and its shaft J revolves then the solenoidcore K is rotated with the shaft J, and by the clutch mechanism described a like rotary motion is given to the wheel I to rotate the gear-wheel G and set the elevator in motion. A spring N is coiled on the core K and rests with one end on the shaft J and presses with the other end against the disk L, so as to normally hold the teeth L and I out of mesh; but when the solenoid K is actuated and it attracts the core K then the core slides longitudinally in the shaft J and moves the clutch-teeth L in engagement with the clutch-teeth I on the gear-wheel I. The motor J is now also actuated, so that the rotary motion of its shaft J rotates the core K, and as the clutch mechanism connects the core with the gearqvheel the latter is rotated and the elevator is set in motion.

As shown in the drawings, the solenoid K and the motor J are arranged in axial alinement with each other, and an electric current is supplied to the solenoid and the motor at the same time. The electric current is supplied by means of two wires 0 0, leading from binding-posts P to an arm Q, fulcrunied at Q on the main frame A, the arm resting on one of the levers 0. (See Fig. 2.) The free end of the arm Q is provided with two contact-plates R It, connected with the wires 0 O and adapted to contact with the contactplates R R insulated from each other and scribed.

the central beam E is set accordingly, and the 1 material to be weighed is poured into the scoop If, so as to overload the same and cause the contact-plates R R and R R to contact with each other to set the solenoid K and the motor .l in action in the manner de The elevator G now throws the surplus material out of the scoop F until the true load is obtained, and as this takes place the central beam falls sufliciently to cause the link D to move upward and lift the lever O, and with it the arm Q, to break the contact between the plates R R and E As soon as the current is broken the motor J stops and the spring N moves the clutch out of connection to disconnect the motorfrom the elevator. If desired, suitable switches may be employed and the motor run continuously without, however, actuating the elevator G until the solenoid K is actuated by proper contact being made at the plates R R and R R to connect the motor with the elevator by way of the clutch mechanism L L I I. As soon as the current is shut off in the solenoid the clutch disconnects the elevat-orand motor, so that whatever momentum the motor may have acquired it will not affect the elevator, which will thus come instantly to a standstill, and consequently the load in the scoop F is not reduced beyond that of a true load.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. In a self-weighing scale, a platform, poise-levers supporting the platform, a motor supported on and movable with the platform, an overload-removing device movable with the platform and adapted to be operated by the motor, a source of electricity for the motor, an electrically-operated part movable through the hollow armature-shaft of the motor, a clutch-section on said electrically-operated part for gearing the motor with the overload-removing device, and a circuit-closer controlled by the poise-levers, substantially as specified.

2. In a self-weighing scale, a platform, poise-levers supporting the platform, a motor supported on the platform, an overload-removing device adapted to be operated by the motor, a source of electricity for the motor a solenoid in circuit with said source of elec tricity, a core for the solenoid extended through the armature-shaft of the motor, a clutch-section on the core for gearing the motor with the overload-removing device, and a circuit-closer controlled by the poise-levers, substantially as specified.

3. A self-weighing scale provided with a scoop, an elevator for removing the surplus material from the scoop, a motor for driving the elevator, a solenoid for controlling the connection between said elevator and motor, and a connection between the motor and elevator, the connection consisting of a clutch having a spring-pressed member controlled by the solenoid and rotated by the motor, the other member of said clutch being adapted to be engaged by said spring-pressed member and being geared with the elevator, substantially as shown and described.

ALVA 'W. B. JOHNSON.

Witnesses:

O. XV. HARRIss, LE Rov C. JOHNSON. 

